fix docker v2 registry issue

README.md

@@ -25,7 +25,7 @@ Build the Docker images with the following commands:
 docker build \
   --label org.label-schema.build-date=$(date -u +"%Y-%m-%dT%H:%M:%SZ") \
   --label org.label-schema.vcs-ref=$(git rev-parse --short HEAD) \
-  --file docker/docker/Dockerfile.linux.amd64 --tag plugins/kaniko-docker .
+  --file docker/docker/Dockerfile.linux.amd64 --tag plugins/kaniko .
 
 docker build \
   --label org.label-schema.build-date=$(date -u +"%Y-%m-%dT%H:%M:%SZ") \

cmd/kaniko-docker/main.go

@@ -18,6 +18,9 @@ const (
 	// Docker file path
 	dockerPath       string = "/kaniko/.docker"
 	dockerConfigPath string = "/kaniko/.docker/config.json"
+
+	v1Registry string = "https://index.docker.io/v1/" // Default registry
+	v2Registry string = "https://index.docker.io/v2/" // v2 registry is not supported
 )
 
 var (
@@ -78,7 +81,7 @@ func main() {
 		cli.StringFlag{
 			Name:   "registry",
 			Usage:  "docker registry",
-			Value:  "https://index.docker.io/v1/",
+			Value:  v1Registry,
 			EnvVar: "PLUGIN_REGISTRY",
 		},
 		cli.StringFlag{
@@ -130,6 +133,12 @@ func createDockerCfgFile(username, password, registry string) error {
 		return fmt.Errorf("Registry must be specified")
 	}
 
+	if registry == v2Registry {
+		fmt.Println("Docker v2 registry is not supported in kaniko. Refer issue: https://github.com/GoogleContainerTools/kaniko/issues/1209")
+		fmt.Printf("Using v1 registry instead: %s\n", v1Registry)
+		registry = v1Registry
+	}
+
 	err := os.MkdirAll(dockerPath, 0600)
 	if err != nil {
 		return errors.Wrap(err, fmt.Sprintf("failed to create %s directory", dockerPath))